Abstract
Gain-guided diode lasers usually have emission wavelengths determined by the manufacturing process, with typically 0.5–1-nm bandwidth. Furthermore, their beam quality is rather poor. We show that external cavities allow for tunable narrow-bandwidth operation of gain-guided diode lasers. At the same time the beam quality is drastically improved; almost diffraction-limited light of more than 200 mW has been achieved over the whole tuning range from 910 to 942 nm with narrow bandwidth.
© 2002 Optical Society of America
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